({{, (RefLink[SqrtBox, paclet:ref/SqrtBox])[x]
is a low-level box construct that represents the displayed object (Sqrt[x]) in notebook expressions. }})

OpenersNotesSection(Spacer1)Details and Options

Inside \(…\) (RefLink[SqrtBox, paclet:ref/SqrtBox])[x] can be input as \@x.

In a notebook a (RefLink[SqrtBox, paclet:ref/SqrtBox]) can be created using (Key1[ctrl, 2]) or (Key1[ctrl, @]). (Key1[ctrl, space]) moves out from under the square root sign.

In (RefLink[StandardForm, paclet:ref/StandardForm]) and (RefLink[InputForm, paclet:ref/InputForm]), (RefLink[SqrtBox, paclet:ref/SqrtBox])[x] is interpreted on input as (RefLink[Sqrt, paclet:ref/Sqrt])[x].

The baseline of (RefLink[SqrtBox, paclet:ref/SqrtBox])[x] is taken to be the baseline of x.

If (RefLink[SqrtBox, paclet:ref/SqrtBox])[x] does not fit on a single line, it is output as x^(1/2).

In (RefLink[StandardForm, paclet:ref/StandardForm]), explicit (RefLink[SqrtBox, paclet:ref/SqrtBox]) objects are output literally. You can use (RefLink[DisplayForm, paclet:ref/DisplayForm]) to see the display form of such objects.

OpenersPrimaryExamplesSection(Spacer1)Examples  (4)

OpenersExampleSection0(Spacer1)Basic Examples  (3)

Display a letter under a square root sign:

SqrtBox["x"]//DisplayForm

A (RefLink[SqrtBox, paclet:ref/SqrtBox]) form is typically interpreted as a square root:

ToExpression[SqrtBox["x"],StandardForm]

The Wolfram Language represents a square root as a 1/2 power:

%//FullForm

The standard formatting for a 1/2-power expression uses (RefLink[SqrtBox, paclet:ref/SqrtBox]):

ToBoxes[x^(1/2),StandardForm]//FullForm

The formatted result looks like this:

x^(1/2)

OpenersExampleSection2(Spacer1)Neat Examples  (1)

Nested square root boxes:

Nest[(Sqrt[1+#])&,Pi,10]

({{DocumentationFooterIconsRelatedFunction.png, ({{See Also}, {(RefLink[Sqrt, paclet:ref/Sqrt])  ▪  (RefLink[RadicalBox, paclet:ref/RadicalBox])  ▪  (RefLink[OverscriptBox, paclet:ref/OverscriptBox])}})}})

({{DocumentationFooterIconsRelatedTutorial.png, ({{Tutorials}, {▪(RefLinkPlain[Representing Textual Forms by Boxes, paclet:tutorial/RepresentingTextualFormsByBoxes])}, {▪(RefLinkPlain[String Representation of Boxes, paclet:tutorial/StringRepresentationOfBoxes])}, {▪(RefLinkPlain[Typing Square Roots, paclet:tutorial/TypingSquareRoots])}})}})

({{DocumentationFooterIconsRelatedGuide.png, ({{Related Guides}, {▪(RefLinkPlain[Low-Level Notebook Structure, paclet:guide/LowLevelNotebookStructure])}})}})